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The Department of Toxic Substances Control (DTSC) of the State of California Environmental Protection Agency is in the process of complying with the Regulatory Structure Update. The Regulatory Structure Update is a comprehensive review and refocusing of California's system for identifying and regulating management of hazardous wastes. As part of this effort, the DTSC proposes to change its current waste classification system that categorizes wastes as hazardous or nonhazardous based on their toxicity. Under the proposed system there would be two risk-based thresholds rather than the single toxicity threshold currently used to distinguish between the wastes. Wastes that contain specific chemicals at concentrations that exceed the upper threshold will be designated as hazardous; those below the lower threshold will be nonhazardous; and those with chemical concentrations between the two thresholds will be "special" wastes and subject to variances for management and disposal. The proposed DTSC system combines toxicity information with short or long-term exposure information to determine the risks associated with the chemicals. Under section 57004 of the California Health and Safety Code, the scientific basis of the proposed waste classification system is subject to external scientific peer review by the National Academy of Sciences, the University of California, or other similar institution of higher learning or group of scientists. This report addresses that regulatory requirement.
Borehole geophysics is frequently applied in hydrogeological environmental investigations where, for example, sites must be evaluated to determine the distribution of contaminants. It is a cost-effective method for obtaining information during several phases of such investigations. Written by one of world's leading experts in the field, A Practical Guide to Borehole Geophysics in Environmental Investigations explains the basic principles of the many tools and techniques used in borehole logging projects. Applications are presented in terms of broad project objectives, providing a hands-on guide to geophysical logging programs, including specific examples of how to obtain and interpret data that meet particular hydrogeologic objectives.
A ubiquitous, largely overlooked groundwater contaminant, 1,4-dioxane escaped notice by almost everyone until the late 1990s. While some dismissed 1,4-dioxane because it was not regulated, others were concerned and required testing and remediation at sites they oversaw. Drawing years of 1,4-dioxane research into a convenient resource, Environmental
This volume, the first of its kind ever, is designed to provide both laypersons and professionals with a detailed description of the occurrence of each common form of cancer in the ethnically, socially, and environmentally complex milieu of a modern urban complex. The place is Los Angeles County, and the patterns of 72 different malignancies are described according to race, age, sex, social class calendar time (since 1972) and most notably, individual neighborhood, using detailed maps of high risk.The book permits residents to screen the malignancies and identify those of special concern locally, and to identify other communities with similar concerns. The pattern of each malignancy is briefly discussed with reference to background knowledge of causation and the degree to which the observed pattern was expected on that basis. Persons residing outside Los Angeles County will identify patterns likely to prevail in their own communities.Physicians and scientific investigators in California and elsewhere can use the material provided to counsel patients and evaluate the consistency of any specific pattern of occurrence with each specific causal hypothesis. A detailed appendix describes the source of data, provides the basis for the choices made in the production of the volume, and gives a perspective on the search for "clusters of malignancy.* Compares different types of cancers with respect to the degree of non-random occurrence* Contains numerous maps detailing the demographic and geographic pattern of cancer occurrence in Los Angeles County* Provides an empirical perspective to the search for disease "clusters"
First Published in 2012. Routledge is an imprint of Taylor & Francis, an informa company.
The National Human Monitoring Program (NHMP) identifies concentrations of specific chemicals in human tissues, including toxicologic testing and risk assessment determinations. This volume evaluates the current activities of the NHMP; identifies important scientific, technical, and programmatic issues; and makes recommendations regarding the design of the program and use of its products.